Adding Heat zones for Basement

[old95er]

I am finishing a basement and plan to add two aones to the existing single zone hot water baseboard heat.

The gas fired boiler has one "circulator" pump attacehd directly to the boiler, T-stat wires go to the pump and to the boiler. The pump feeds the current one zone heat loop.

Please help with the add on. I plan to add two circulators and two zone valves to creat the two new zones in the basement.

There is a drain right before the circ pump and shutoff valve, can I just place a T in betweeen the current pump and the drain to feed the new zones?

For Wiring, do I just wire from the new tstats to each valve and pump? OR do I need a switching relay? If so, do I need a three zone switching relay?

Thanks for your help!!

[Phelps]

Remember that the pumps pull and don't push, when assessing your flow scheme.

[old95er]

pulling pumps

what does that mean?

DO I place pumps in the beginning of the output loop after the boiler, or at the end of the return in front of the boiler??

[old95er]

controllers

now I am wondering how to control the boiler circulator and the new circulators. . .

Does the main circulator on my Well Mclain CG4 boiler come on whenever the boiler is on?

Do I need to rewire with a controller?

Should I just add two zone valves after the main circulator. How do they get power?

I am sure this is a straightforward project, I just don't want to mess it up!!